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Analog Devices Inc./Maxim Integrated MAX814TCSA+
- Part No.:
- MAX814TCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX814TCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:374
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Product details
Overview
MAX814TCSA+ from Maxim Integrated is a ±1% accurate, low-power microprocessor supervisory circuit with active-low and active-high reset outputs, 3.03V fixed reset threshold, 200ms reset timeout, and power-fail monitoring capability. It ensures reliable µP reset during power-up, brownout, and power-down in 3.3V systems such as portable medical instruments and battery-powered controllers.
For engineers reviewing the MAX814TCSA+ datasheet, MAX814TCSA+ pinout, MAX814TCSA+ application, or MAX814TCSA+ equivalent, this page delivers verified functional identity, confirmed 8-pin SO package mapping, validated reset/warning timing behavior, and two field-validated alternative parts for 3.3V supervisory use cases.
Technical Context
The MAX814TCSA+ implements a precision voltage comparator with 3.03V ±1% trip point referenced to VCC, guaranteeing RESET assertion down to VCC = 1V and immunity to fast transients via internal glitch filtering. Its dual-reset output (RESET and RESET) provides both active-low and active-high signaling without external inversion.
It integrates a dedicated low-line detector (60mV above reset threshold), a power-fail comparator with 1.70V reference (PFI/PFO), and manual reset input (MR) with 150µA internal pullup - all operating from a single 3.06V–5.5V supply while consuming ≤75µA typical current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.03V ±1% - guarantees deterministic reset initiation at precisely defined VCC level for 3.3V systems |
| Reset Timeout | 200ms minimum - ensures µP remains held in reset long enough for stable clock and supply settling |
| Supply Current | 75µA max - enables multi-year operation in coin-cell–powered portable equipment |
| VCC Operating Range | 3.06V to 5.5V - supports mixed-voltage designs including 3.3V logic with 5V peripherals |
| Low-Line Threshold | 60mV above reset threshold - provides early warning before reset assertion, enabling graceful shutdown |
| Power-Fail Reference | 1.70V - allows configurable undervoltage detection on auxiliary rails via PFI voltage divider |
| MR Input Pullup | 150µA - eliminates need for external resistor when using momentary switch to GND |
Pinout & Package
MAX814TCSA+ is housed in an 8-pin SO (Small Outline) package with gull-wing leads, JEDEC MS-012AC compliant, 3.9mm body width, 1.27mm pitch, and RoHS-compliant lead-free finish (+ suffix).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR | Manual reset input - active-low trigger with internal 150µA pullup; asserts reset when pulled below 1.10V |
| 2 | VCC | Positive supply input - powers all internal comparators and outputs; RESET valid down to 1V |
| 3 | GND | Ground reference - common return path for all analog and digital functions |
| 4 | PFI | Power-fail input - high-impedance node compared to 1.70V reference; used for auxiliary rail monitoring |
| 5 | PFO | Power-fail output - open-drain compatible, sinks ≥1.2mA when PFI < 1.70V; signals impending supply failure |
| 6 | LOW LINE | Low-line warning output - active-low signal asserted when VCC falls 60mV above reset threshold |
| 7 | RESET | Active-low reset output - guaranteed logic low (≤0.4V) during reset; meets µP reset input requirements |
| 8 | RESET | Active-high reset output - inverted copy of RESET; eliminates need for external inverter in some designs |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Eliminates system-level calibration and ensures first-time-right reset behavior across temperature and voltage |
| Guaranteed RESET validity to VCC = 1V | Prevents undefined µP state during deep brownout, enabling safe low-voltage shutdown sequencing |
| Independent low-line detector (60mV hysteresis) | Provides 200µs–500µs advance warning before reset, sufficient for EEPROM save or status flag storage |
| Power-supply glitch immunity | Rejects transients ≤30µs at 100mV overdrive, preventing spurious resets in noisy industrial environments |
| 8-pin SO/DIP pin-compatible footprint | Enables drop-in replacement across MAX814/MAX815/MAX816 families without PCB redesign |
Applications
| Medical Instrumentation | Portable Diagnostic Controller |
|---|---|
Use Scenario: Battery-powered handheld ECG monitor requiring fail-safe startup and orderly shutdown upon low-battery detection. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET on power-up and brownout, while LOW LINE triggers ADC data flush before reset. Use Value: Prevents corrupted waveform storage by ensuring µP completes memory write before VCC collapse. | Use Scenario: Portable blood glucose meter with dual-voltage rails (3.3V logic, 5V sensor interface) and manual reset button. IC Role / Device Role / Timing Role: Dual-reset output drives µP reset pin and status LED; MR accepts tactile switch without debounce components. Use Value: Reduces BOM count by integrating manual reset pullup and eliminating external inverter or Schmitt trigger. |
| Industrial Edge Sensor Node | Set-Top Box Power Management |
Use Scenario: Wireless temperature sensor node powered by energy harvesting, requiring ultra-low quiescent current and early power-fail warning. IC Role / Device Role / Timing Role: PFI monitors harvested rail via resistor divider; PFO interrupts µP to store last valid reading before shutdown. Use Value: Enables >10-year battery life with 75µA max supply current and deterministic 1.70V PFI threshold. | Use Scenario: Consumer STB with 3.3V SoC and 12V power supply, needing coordinated reset of main processor and peripheral ICs. IC Role / Device Role / Timing Role: RESET and RESET drive SoC and HDMI controller simultaneously; PFO monitors 12V rail via voltage divider. Use Value: Synchronizes full-system reset and prevents partial initialization that causes HDMI handshake failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814TESA+ | Same 3.03V reset threshold, identical pinout and function, but rated for -40°C to +85°C extended temperature range | Suitable for outdoor or automotive-adjacent deployments where ambient exceeds +70°C | Select MAX814TESA+ when operating beyond commercial temperature limits; otherwise MAX814TCSA+ suffices |
| TPS3808G33DBVR | 3.3V reset threshold (±0.5%), 200ms delay, but only active-low RESET output and no LOW LINE or dual-reset feature | Lacks early-warning capability and active-high output; requires external inverter for RESET | Choose TPS3808G33DBVR only if dual-reset and low-line warning are unnecessary and tighter threshold tolerance is critical |
Compared with MAX814TESA+, MAX814TCSA+ trades extended temperature support for lower cost in commercial-grade applications; compared with TPS3808G33DBVR, it delivers integrated early-warning and dual-output functionality at the expense of slightly relaxed threshold tolerance.
Availability
MAX814TCSA+ is available at Aetrix Electronics and suitable for medical instrumentation, portable diagnostic controllers, industrial edge sensor nodes, and set-top box power management requiring stable component supply across production lifecycles.
Supply support for MAX814TCSA+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, medical, and communications applications.
The MAX814 family targets high-reliability µP supervision in space-constrained, battery-sensitive systems where reset accuracy, low power, and multi-rail monitoring are essential.
FAQ
What is the reset threshold voltage of the MAX814TCSA+?
The MAX814TCSA+ has a factory-trimmed reset threshold of 3.03V ±1%, optimized for 3.3V supply systems. This value is fixed and non-adjustable - unlike the MAX816, which uses an external resistor divider. The threshold remains stable across temperature and supply variations, with typical deviation under ±2mV from 0°C to +70°C per the datasheet's Figure 7d and electrical characteristics table.
Does the MAX814TCSA+ provide both active-low and active-high reset outputs?
Yes, the MAX814TCSA+ provides two independent reset outputs: pin 7 (RESET) is active-low, and pin 8 (RESET) is active-high - the logical inverse. This eliminates the need for external inverters in systems requiring either polarity, and simplifies interface to diverse µP reset inputs. Both outputs share the same 200ms timeout and respond identically to VCC transitions and MR assertion.
Can the MAX814TCSA+ monitor voltages other than VCC?
Yes, the MAX814TCSA+ can monitor auxiliary voltages using its PFI (power-fail input) pin. By connecting a resistor divider from the target rail to PFI and GND, the device compares the divided voltage against its internal 1.70V reference. When the monitored rail drops below the corresponding threshold, PFO asserts low - enabling early warning for any DC supply, including negative rails with appropriate biasing, as documented in Figures 11 and 12 of the datasheet.
What is the purpose of the LOW LINE output on the MAX814TCSA+?
The LOW LINE output (pin 6) is a dedicated early-warning signal that goes low when VCC falls 60mV above the 3.03V reset threshold - i.e., at ~3.09V. It provides 200–500µs advance notice before RESET asserts, allowing time-critical operations like saving volatile data or disabling outputs. Unlike RESET, LOW LINE has no minimum pulse width and returns high immediately once VCC recovers above the threshold.
How does the manual reset (MR) input behave on the MAX814TCSA+?
The MR input (pin 1) is an active-low, internally pulled up (150µA) signal. Pulling MR below 1.10V asserts both RESET outputs immediately. Reset remains active for 200ms after MR returns high, ensuring robust de-bouncing without external components. The input accepts CMOS/TTL logic levels and tolerates direct connection to switches or open-drain drivers - making it ideal for front-panel reset buttons or test-mode control lines.
MAX814TCSA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.03V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX814TCSA+ FAQ
1.How can I place an order for MAX814TCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX814TCSA+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX814TCSA+ reliable?
The price and inventory of MAX814TCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX814TCSA+ is usually 5 days.
3.What payment methods are accepted for MAX814TCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX814TCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX814TCSA+?
MAX814TCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX814TCSA+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX814TCSA+?
For technical support, including MAX814TCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX814TCSA+ requirements.
6.How does Aetrix verify that MAX814TCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX814TCSA+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX814TCSA+ meets industry standards.
7.What is the process for return or replacement of MAX814TCSA+?
All MAX814TCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX814TCSA+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX814TCSA+ part is unused and in its original packaging.
Return procedure for MAX814TCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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